Among `N_(2)^(+), N_(2)^(-) and N_(2)^(2-)` the least stable ion is ...........

Explanation

To determine which ion among \( N_2^+, N_2^-, \) and \( N_2^{2-} \) is the least stable, we can use Molecular Orbital Theory (MOT) to analyze their electronic configurations and stability based on the number of unpaired electrons.

### Step-by-Step Solution:

1. **Identify the Molecular Orbital Configuration of \( N_2 \)**:
- The molecular orbital configuration for neutral \( N_2 \) (which has 14 electrons) is:
\[
\sigma_{1s}^2 \sigma_{1s}^*^2 \sigma_{2s}^2 \sigma_{2s}^*^2 \sigma_{2p_z}^2 \pi_{2p_x}^2 \pi_{2p_y}^2 \pi_{2p_x}^*^0 \pi_{2p_y}^*^0
...